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</o:shapelayout></xml><![endif]--></head><body lang=FR link=blue vlink=purple><div class=WordSection1><p class=MsoPlainText><font size=2 face=Calibri><span style='font-size:11.0pt'>Author: Gérard Petit (IERS Conventions Center)<o:p></o:p></span></font></p><p class=MsoPlainText><font size=2 face=Calibri><span style='font-size:10.0pt'><o:p> </o:p></span></font></p><p class=MsoPlainText><font size=2 face=Calibri><span lang=EN-US style='font-size:11.0pt'>Information on the updates to the IERS Conventions (2010)<o:p></o:p></span></font></p><p class=MsoPlainText><font size=2 face=Calibri><span lang=EN-US style='font-size:11.0pt'><o:p> </o:p></span></font></p><p class=MsoPlainText><font size=2 face=Calibri><span lang=EN-US style='font-size:11.0pt'>The IERS Conventions Center informs of the following updates:<o:p></o:p></span></font></p><p class=MsoPlainText><font size=2 face=Calibri><span lang=EN-US style='font-size:11.0pt'><o:p> </o:p></span></font></p><p class=MsoPlainText><b><font size=2 face=Calibri><span lang=EN-US style='font-size:11.0pt;font-weight:bold'>15 January 2013<o:p></o:p></span></font></b></p><p class=MsoPlainText><font size=2 face=Calibri><span lang=EN-US style='font-size:11.0pt'><o:p> </o:p></span></font></p><p class=MsoPlainText><font size=2 face=Calibri><span lang=EN-US style='font-size:11.0pt'>* Chapter 9 "Models for atmospheric propagation delays" has been updated, see <a href="http://tai.bipm.org/iers/convupdt/convupdt_c9.html">http://tai.bipm.org/iers/convupdt/convupdt_c9.html</a> .<o:p></o:p></span></font></p><p class=MsoPlainText><font size=2 face=Calibri><span lang=EN-US style='font-size:11.0pt'>Changes are the following:<o:p></o:p></span></font></p><p class=MsoPlainText style='margin-left:36.0pt;text-indent:-18.0pt;mso-list:l0 level1 lfo1'><![if !supportLists]><font size=2 face=Symbol><span lang=EN-US style='font-size:10.0pt;font-family:Symbol'><span style='mso-list:Ignore'>ˇ<font size=1 face="Times New Roman"><span style='font:7.0pt "Times New Roman"'> </span></font></span></span></font><![endif]><span lang=EN-US>Introduce the model Global Pressure and Temperature 2 in sections 9.2 "Tropospheric model for radio techniques" and 9.3 "Sources for meteorological data" (provided by J. Boehm). <o:p></o:p></span></p><p class=MsoPlainText style='margin-left:36.0pt;text-indent:-18.0pt;mso-list:l0 level1 lfo1'><![if !supportLists]><font size=2 face=Symbol><span lang=EN-US style='font-size:10.0pt;font-family:Symbol'><span style='mso-list:Ignore'>ˇ<font size=1 face="Times New Roman"><span style='font:7.0pt "Times New Roman"'> </span></font></span></span></font><![endif]><span lang=EN-US>In the section 9.4 "Ionospheric models for radio techniques", correct some numerical values in a number of equations for using exact CODATA (2010) values of fundamental constants (noted by R. Langley). Changes are not significant with respect to the uncertainties of the quantities. <o:p></o:p></span></p><p class=MsoPlainText><font size=2 face=Calibri><span lang=EN-US style='font-size:11.0pt'><o:p> </o:p></span></font></p><p class=MsoPlainText><font size=2 face=Calibri><span lang=EN-US style='font-size:11.0pt'>* Appendix E with the IUGG Resolution 3 Adopted at the XXVth General Assembly (2012), has been added, see <a href="http://tai.bipm.org/iers/convupdt/convupdt_ap.html">http://tai.bipm.org/iers/convupdt/convupdt_ap.html</a> .<o:p></o:p></span></font></p><p class=MsoPlainText><font size=2 face=Calibri><span lang=EN-US style='font-size:11.0pt'><o:p> </o:p></span></font></p><p class=MsoPlainText><font size=2 face=Calibri><span lang=EN-US style='font-size:11.0pt'><o:p> </o:p></span></font></p><p class=MsoPlainText><font size=2 face=Calibri><span lang=EN-US style='font-size:11.0pt'>The USNO web site <a href="http://maia.usno.navy.mil/conv2010/convupdt.html">http://maia.usno.navy.mil/conv2010/convupdt.html</a> has similarly been updated.<o:p></o:p></span></font></p><p class=MsoPlainText><font size=2 face=Calibri><span lang=EN-US style='font-size:11.0pt'><o:p> </o:p></span></font></p><p class=MsoPlainText><font size=2 face=Calibri><span style='font-size:11.0pt'>Gérard Petit and Brian Luzum<o:p></o:p></span></font></p><p class=MsoPlainText><font size=2 face=Calibri><span style='font-size:11.0pt'>IERS Conventions Center<o:p></o:p></span></font></p><p class=MsoPlainText><font size=2 face=Calibri><span style='font-size:10.0pt'><o:p> </o:p></span></font></p></div></body></html>